/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/PreviewMesh.h
Apply EditFunc to the internal mesh, and update spatial data structure if requested, but do not update/rebuild rendering data structures. NotifyDeferredEditOcurred() must be called to complete a deferred edit, this will update the rendering mesh. DeferredEditMesh can be called multiple times beforeNotifyDeferredEditCompleted()is called.
void DeferredEditMesh ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) &)> EditFunc, bool bRebuildSpatial )